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    <h1>chomp
      <small>Function</small>
    
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    <h2>
public function chomp(source_string, token, delimiters)
    
    
   
</h2>
    
  


    
    <h2 id="name">NAME</h2>
<div class="codehilite"><pre><span></span><code>chomp(3f) - [M_strings:TOKENS] Tokenize a string, consuming it one
token per call
(LICENSE:PD)
</code></pre></div>

<h2 id="synopsis">SYNOPSIS</h2>
<div class="codehilite"><pre><span></span><code><span class="k">function</span><span class="w"> </span><span class="nf">chomp</span><span class="p">(</span>source_string,token[,delimiters]<span class="p">)</span><span class="w"></span>

<span class="w"> </span><span class="n">character</span><span class="p">(</span><span class="n">len</span><span class="p">=</span><span class="o">*</span><span class="p">)</span><span class="w">                     </span><span class="p">::</span><span class="w"> </span><span class="n">source_string</span><span class="w"></span>
<span class="w"> </span><span class="n">character</span><span class="p">(</span><span class="n">len</span><span class="p">=:),</span><span class="n">intent</span><span class="p">(</span><span class="n">out</span><span class="p">)</span><span class="w">         </span><span class="p">::</span><span class="w"> </span><span class="n">token</span><span class="w"></span>
<span class="w"> </span><span class="n">character</span><span class="p">(</span><span class="n">len</span><span class="p">=:),</span><span class="n">intent</span><span class="p">(</span><span class="n">in</span><span class="p">),</span><span class="n">optional</span><span class="w"> </span><span class="p">::</span><span class="w"> </span><span class="n">delimiters</span><span class="w"></span>
<span class="w"> </span><span class="n">integer</span><span class="w">                              </span><span class="p">::</span><span class="w"> </span><span class="n">chomp</span><span class="w"></span>
</code></pre></div>

<h2 id="description">DESCRIPTION</h2>
<div class="codehilite"><pre><span></span><code><span class="nv">The</span> <span class="nv">CHOMP</span><span class="ss">(</span><span class="mi">3</span><span class="nv">f</span><span class="ss">)</span> <span class="nv">function</span> <span class="nv">is</span> <span class="nv">used</span> <span class="nv">to</span> <span class="nv">isolate</span> <span class="nv">sequential</span> <span class="nv">tokens</span> <span class="nv">in</span> <span class="nv">a</span>
<span class="nv">string</span>, <span class="nv">SOURCE_STRING</span>. <span class="nv">These</span> <span class="nv">tokens</span> <span class="nv">are</span> <span class="nv">delimited</span> <span class="nv">in</span> <span class="nv">the</span> <span class="nv">string</span> <span class="nv">by</span> <span class="nv">at</span>
<span class="nv">least</span> <span class="nv">one</span> <span class="nv">of</span> <span class="nv">the</span> <span class="nv">characters</span> <span class="nv">in</span> <span class="nv">DELIMITERS</span>. <span class="nv">This</span> <span class="nv">routine</span> <span class="nv">consumes</span> <span class="nv">the</span>
<span class="nv">source_string</span> <span class="nv">one</span> <span class="nv">token</span> <span class="nv">per</span> <span class="nv">call</span>. <span class="nv">It</span> <span class="nv">returns</span> <span class="o">-</span><span class="mi">1</span> <span class="nv">when</span> <span class="nv">complete</span>. <span class="nv">The</span>
<span class="nv">default</span> <span class="nv">delimiter</span> <span class="nv">list</span> <span class="nv">is</span> <span class="s2">&quot;</span><span class="s">space,tab,carriage return,newline</span><span class="s2">&quot;</span>.
</code></pre></div>

<h2 id="options">OPTIONS</h2>
<div class="codehilite"><pre><span></span><code> SOURCE_STRING  string to tokenize
 DELIMITERS     list of separator characters
</code></pre></div>

<h2 id="returns">RETURNS</h2>
<div class="codehilite"><pre><span></span><code> TOKEN          returned token
 CHOMP          status flag. 0 = success, -1 = no tokens remain
</code></pre></div>

<h2 id="examples">EXAMPLES</h2>
<p>Sample program:</p>
<div class="codehilite"><pre><span></span><code><span class="nv">program</span> <span class="nv">demo_chomp</span>

<span class="nv">use</span> <span class="nv">M_strings</span>, <span class="nv">only</span> : <span class="nv">chomp</span>
<span class="nv">implicit</span> <span class="nv">none</span>
<span class="nv">character</span><span class="ss">(</span><span class="nv">len</span><span class="o">=</span><span class="mi">100</span><span class="ss">)</span>            :: <span class="nv">inline</span>
<span class="nv">character</span><span class="ss">(</span><span class="nv">len</span><span class="o">=</span>:<span class="ss">)</span>,<span class="nv">allocatable</span>  :: <span class="nv">token</span>
<span class="nv">character</span><span class="ss">(</span><span class="nv">len</span><span class="o">=*</span><span class="ss">)</span>,<span class="nv">parameter</span>    :: <span class="nv">delimiters</span><span class="o">=</span><span class="s1">&#39;</span><span class="s"> ;,</span><span class="s1">&#39;</span>
<span class="nv">integer</span>                       :: <span class="nv">ios</span>
<span class="nv">integer</span>                       :: <span class="nv">icount</span>
<span class="nv">integer</span>                       :: <span class="nv">itoken</span>
   <span class="nv">icount</span><span class="o">=</span><span class="mi">0</span>
   <span class="k">do</span>        <span class="o">!</span> <span class="nv">read</span> <span class="nv">lines</span> <span class="nv">from</span> <span class="nv">stdin</span> <span class="k">until</span> <span class="k">end</span><span class="o">-</span><span class="nv">of</span><span class="o">-</span><span class="nv">file</span> <span class="nv">or</span> <span class="nv">error</span>
      <span class="nv">read</span> <span class="ss">(</span><span class="nv">unit</span><span class="o">=*</span>,<span class="nv">fmt</span><span class="o">=</span><span class="s2">&quot;</span><span class="s">(a)</span><span class="s2">&quot;</span>,<span class="nv">iostat</span><span class="o">=</span><span class="nv">ios</span><span class="ss">)</span> <span class="nv">inline</span>
      <span class="k">if</span><span class="ss">(</span><span class="nv">ios</span>.<span class="nv">ne</span>.<span class="mi">0</span><span class="ss">)</span><span class="nv">stop</span>
      <span class="nv">icount</span><span class="o">=</span><span class="nv">icount</span><span class="o">+</span><span class="mi">1</span>
      <span class="nv">itoken</span><span class="o">=</span><span class="mi">0</span>
      <span class="nv">write</span><span class="ss">(</span><span class="o">*</span>,<span class="o">*</span><span class="ss">)</span><span class="s1">&#39;</span><span class="s">INLINE </span><span class="s1">&#39;</span>,<span class="nv">trim</span><span class="ss">(</span><span class="nv">inline</span><span class="ss">)</span>
      <span class="k">do</span> <span class="k">while</span> <span class="ss">(</span> <span class="nv">chomp</span><span class="ss">(</span><span class="nv">inline</span>,<span class="nv">token</span>,<span class="nv">delimiters</span><span class="ss">)</span>.<span class="nv">ge</span>. <span class="mi">0</span><span class="ss">)</span>
         <span class="nv">itoken</span><span class="o">=</span><span class="nv">itoken</span><span class="o">+</span><span class="mi">1</span>
         <span class="nv">print</span> <span class="o">*</span>, <span class="nv">itoken</span>,<span class="s1">&#39;</span><span class="s">TOKEN=[</span><span class="s1">&#39;</span><span class="o">//</span><span class="nv">trim</span><span class="ss">(</span><span class="nv">token</span><span class="ss">)</span><span class="o">//</span><span class="s1">&#39;</span><span class="s">]</span><span class="s1">&#39;</span>
      <span class="nv">enddo</span>
   <span class="nv">enddo</span>

<span class="k">end</span> <span class="nv">program</span> <span class="nv">demo_chomp</span>
</code></pre></div>

<p>sample input file</p>
<div class="codehilite"><pre><span></span><code> <span class="nt">this</span> <span class="nt">is</span> <span class="nt">a</span> <span class="nt">test</span> <span class="nt">of</span> <span class="nt">chomp</span><span class="o">;</span> <span class="nt">A</span><span class="p">:</span><span class="nd">B</span> <span class="o">:;,</span><span class="nt">C</span><span class="o">;;</span>
</code></pre></div>

<p>sample output file</p>
<div class="codehilite"><pre><span></span><code><span class="w"> </span><span class="o">&gt;</span><span class="w"> </span><span class="n">INLINE</span><span class="w">     </span><span class="n">this</span><span class="w"> </span><span class="k">is</span><span class="w"> </span><span class="n">a</span><span class="w"> </span><span class="n">test</span><span class="w"> </span><span class="k">of</span><span class="w"> </span><span class="n">chomp</span><span class="p">;</span><span class="w"> </span><span class="nl">A</span><span class="p">:</span><span class="n">B</span><span class="w"> </span><span class="err">:</span><span class="p">;,</span><span class="n">C</span><span class="p">;;</span><span class="w"></span>
<span class="w"> </span><span class="o">&gt;</span><span class="w">           </span><span class="mi">1</span><span class="w"> </span><span class="n">TOKEN</span><span class="o">=[</span><span class="n">this</span><span class="o">]</span><span class="w"></span>
<span class="w"> </span><span class="o">&gt;</span><span class="w">           </span><span class="mi">2</span><span class="w"> </span><span class="n">TOKEN</span><span class="o">=[</span><span class="n">is</span><span class="o">]</span><span class="w"></span>
<span class="w"> </span><span class="o">&gt;</span><span class="w">           </span><span class="mi">3</span><span class="w"> </span><span class="n">TOKEN</span><span class="o">=[</span><span class="n">a</span><span class="o">]</span><span class="w"></span>
<span class="w"> </span><span class="o">&gt;</span><span class="w">           </span><span class="mi">4</span><span class="w"> </span><span class="n">TOKEN</span><span class="o">=[</span><span class="n">test</span><span class="o">]</span><span class="w"></span>
<span class="w"> </span><span class="o">&gt;</span><span class="w">           </span><span class="mi">5</span><span class="w"> </span><span class="n">TOKEN</span><span class="o">=[</span><span class="n">of</span><span class="o">]</span><span class="w"></span>
<span class="w"> </span><span class="o">&gt;</span><span class="w">           </span><span class="mi">6</span><span class="w"> </span><span class="n">TOKEN</span><span class="o">=[</span><span class="n">chomp</span><span class="o">]</span><span class="w"></span>
<span class="w"> </span><span class="o">&gt;</span><span class="w">           </span><span class="mi">7</span><span class="w"> </span><span class="n">TOKEN</span><span class="o">=[</span><span class="n">A:B</span><span class="o">]</span><span class="w"></span>
<span class="w"> </span><span class="o">&gt;</span><span class="w">           </span><span class="mi">8</span><span class="w"> </span><span class="n">TOKEN</span><span class="o">=[</span><span class="n">:</span><span class="o">]</span><span class="w"></span>
<span class="w"> </span><span class="o">&gt;</span><span class="w">           </span><span class="mi">9</span><span class="w"> </span><span class="n">TOKEN</span><span class="o">=[</span><span class="n">C</span><span class="o">]</span><span class="w"></span>
</code></pre></div>

<h2 id="author">AUTHOR</h2>
<div class="codehilite"><pre><span></span><code>John S. Urban
</code></pre></div>

<h2 id="license">LICENSE</h2>
<div class="codehilite"><pre><span></span><code>Public Domain
</code></pre></div>
    

    <h3>Arguments</h3>
    
      
<table class="table table-striped varlist">
<thead><tr><th>Type</th>
<th>Intent</th><th>Optional</th>
<th>Attributes</th><th></th><th>Name</th><th></th></thead>



<tbody>

  
  
  
  
<tr>
  
  <td><span class="anchor" id="variable-source_string"></span>character(len=*)</td>
  <td></td>
  <td></td>
  
  <td></td><td>::</td>
  <td><strong>source_string</strong></td><td></td>
  
</tr>

  
  
  
  
<tr>
  
  <td><span class="anchor" id="variable-token"></span>character(len=:),</td>
  <td>intent(out),</td>
  <td></td>
  
  <td>allocatable</td><td>::</td>
  <td><strong>token</strong></td><td></td>
  
</tr>

  
  
  
  
<tr>
  
  <td><span class="anchor" id="variable-delimiters"></span>character(len=*),</td>
  <td>intent(in),</td>
  <td>optional</td>
  
  <td></td><td>::</td>
  <td><strong>delimiters</strong></td><td></td>
  
</tr>

</tbody>
</table>

    
    
    
    
    
    
    
   <h3>Return Value <small><span class="anchor" id="variable-chomp"></span>integer
  </small></h3>
    
    
    
    
     
    <br>

    <section class="visible-xs visible-sm hidden-md">
      
<h3>Contents</h3>
 



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  <div class="panel-heading text-left"><h3 class="panel-title"><a data-toggle="collapse" href="#vars-1">Variables</a></h3></div>
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      <a class="list-group-item" href="../proc/chomp.html#variable-delimiters_local">delimiters_local</a>
      
      <a class="list-group-item" href="../proc/chomp.html#variable-isource_len">isource_len</a>
      
      <a class="list-group-item" href="../proc/chomp.html#variable-token_end">token_end</a>
      
      <a class="list-group-item" href="../proc/chomp.html#variable-token_start">token_start</a>
      
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</div>




















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  <div class="panel-heading text-left"><h3 class="panel-title">Source Code</h3></div>
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    <a class="list-group-item" href="../proc/chomp.html#src">chomp</a>
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</div>



    </section>
    <br class="visible-xs visible-sm hidden-md">

    

    
    <section>    
      <h2>Variables</h2>
    
<table class="table table-striped varlist">
<thead><tr><th>Type</th><th>Visibility</th>

<th>Attributes</th><th></th><th>Name</th><th></th><th>Initial</th><th></th></thead>



<tbody>

  
  
  
  
<tr>
  
  <td><span class="anchor" id="variable-delimiters_local"></span>character(len=:),</td>
  
  <td>public,</td>
  <td>allocatable</td><td>::</td>
  <td><strong>delimiters_local</strong></td><td></td><td></td><td></td>
  
</tr>

  
  
  
  
<tr>
  
  <td><span class="anchor" id="variable-isource_len"></span>integer,</td>
  
  <td>public</td>
  <td></td><td>::</td>
  <td><strong>isource_len</strong></td><td></td><td></td><td></td>
  
</tr>

  
  
  
  
<tr>
  
  <td><span class="anchor" id="variable-token_end"></span>integer,</td>
  
  <td>public</td>
  <td></td><td>::</td>
  <td><strong>token_end</strong></td><td></td><td></td><td></td>
  
</tr>

  
  
  
  
<tr>
  
  <td><span class="anchor" id="variable-token_start"></span>integer,</td>
  
  <td>public</td>
  <td></td><td>::</td>
  <td><strong>token_start</strong></td><td></td><td></td><td></td>
  
</tr>

</tbody>
</table>

    </section>
    <br>
    
    
    
    
    

    
    
    
    
    


    
    
    
    <section>
    <h2><span class="anchor" id="src"></span>Source Code</h2>
    <div class="highlight"><pre><span></span><span class="k">FUNCTION </span><span class="n">chomp</span><span class="p">(</span><span class="n">source_string</span><span class="p">,</span><span class="n">token</span><span class="p">,</span><span class="n">delimiters</span><span class="p">)</span>

<span class="c">! ident_9=&quot;@(#)M_strings::chomp(3f): Tokenize a string : JSU- 20151030&quot;</span>

<span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=*</span><span class="p">)</span>                         <span class="kd">::</span> <span class="n">source_string</span>    <span class="c">! string to tokenize</span>
<span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="p">:),</span><span class="k">allocatable</span><span class="p">,</span><span class="k">intent</span><span class="p">(</span><span class="n">out</span><span class="p">)</span> <span class="kd">::</span> <span class="n">token</span>            <span class="c">! returned token</span>
<span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=*</span><span class="p">),</span><span class="k">intent</span><span class="p">(</span><span class="n">in</span><span class="p">),</span><span class="k">optional</span>     <span class="kd">::</span> <span class="n">delimiters</span>       <span class="c">! list of separator characters</span>
<span class="kt">integer</span>                                  <span class="kd">::</span> <span class="n">chomp</span>            <span class="c">! returns copy of shifted source_string</span>
<span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="p">:),</span><span class="k">allocatable</span>             <span class="kd">::</span> <span class="n">delimiters_local</span>
<span class="kt">integer</span>                                  <span class="kd">::</span> <span class="n">token_start</span>      <span class="c">! beginning of token found if function result is .true.</span>
<span class="kt">integer</span>                                  <span class="kd">::</span> <span class="n">token_end</span>        <span class="c">! end of token found if function result is .true.</span>
<span class="kt">integer</span>                                  <span class="kd">::</span> <span class="n">isource_len</span>
<span class="c">!-----------------------------------------------------------------------------------------------------------------------------------</span>
<span class="c">!  calculate where token_start should start for this pass</span>
   <span class="k">if</span><span class="p">(</span><span class="nb">present</span><span class="p">(</span><span class="n">delimiters</span><span class="p">))</span><span class="k">then</span>
<span class="k">      </span><span class="n">delimiters_local</span><span class="o">=</span><span class="n">delimiters</span>
   <span class="k">else</span>                                          <span class="c">! increment start to previous end + 1</span>
      <span class="n">delimiters_local</span><span class="o">=</span><span class="nb">char</span><span class="p">(</span><span class="mi">32</span><span class="p">)</span><span class="o">//</span><span class="nb">char</span><span class="p">(</span><span class="mi">09</span><span class="p">)</span><span class="o">//</span><span class="nb">char</span><span class="p">(</span><span class="mi">10</span><span class="p">)</span><span class="o">//</span><span class="nb">char</span><span class="p">(</span><span class="mi">13</span><span class="p">)</span> <span class="c">! space,horizontal tab, newline, carriage return</span>
   <span class="k">endif</span>
<span class="c">!-----------------------------------------------------------------------------------------------------------------------------------</span>
   <span class="n">isource_len</span><span class="o">=</span><span class="nb">len</span><span class="p">(</span><span class="n">source_string</span><span class="p">)</span>                <span class="c">! length of input string</span>
<span class="c">!-----------------------------------------------------------------------------------------------------------------------------------</span>
   <span class="c">! find beginning of token</span>
   <span class="n">token_start</span><span class="o">=</span><span class="mi">1</span>
   <span class="k">do while</span> <span class="p">(</span><span class="n">token_start</span> <span class="p">.</span><span class="n">le</span><span class="p">.</span> <span class="n">isource_len</span><span class="p">)</span>       <span class="c">! step thru each character to find next delimiter, if any</span>
      <span class="k">if</span><span class="p">(</span><span class="nb">index</span><span class="p">(</span><span class="n">delimiters_local</span><span class="p">,</span><span class="n">source_string</span><span class="p">(</span><span class="n">token_start</span><span class="p">:</span><span class="n">token_start</span><span class="p">))</span> <span class="p">.</span><span class="n">ne</span><span class="p">.</span> <span class="mi">0</span><span class="p">)</span> <span class="k">then</span>
<span class="k">         </span><span class="n">token_start</span> <span class="o">=</span> <span class="n">token_start</span> <span class="o">+</span> <span class="mi">1</span>
      <span class="k">else</span>
<span class="k">         exit</span>
<span class="k">      endif</span>
<span class="k">   enddo</span>
<span class="c">!-----------------------------------------------------------------------------------------------------------------------------------</span>
   <span class="n">token_end</span><span class="o">=</span><span class="n">token_start</span>
   <span class="k">do while</span> <span class="p">(</span><span class="n">token_end</span> <span class="p">.</span><span class="n">le</span><span class="p">.</span> <span class="n">isource_len</span><span class="o">-</span><span class="mi">1</span><span class="p">)</span>                         <span class="c">! step thru each character to find next delimiter, if any</span>
      <span class="k">if</span><span class="p">(</span><span class="nb">index</span><span class="p">(</span><span class="n">delimiters_local</span><span class="p">,</span><span class="n">source_string</span><span class="p">(</span><span class="n">token_end</span><span class="o">+</span><span class="mi">1</span><span class="p">:</span><span class="n">token_end</span><span class="o">+</span><span class="mi">1</span><span class="p">))</span> <span class="p">.</span><span class="n">ne</span><span class="p">.</span> <span class="mi">0</span><span class="p">)</span> <span class="k">then</span>  <span class="c">! found a delimiter in next character</span>
         <span class="k">exit</span>
<span class="k">      endif</span>
<span class="k">      </span><span class="n">token_end</span> <span class="o">=</span> <span class="n">token_end</span> <span class="o">+</span> <span class="mi">1</span>
   <span class="k">enddo</span>
   <span class="c">!write(*,*)&#39;TOKEN_START &#39;,token_start</span>
   <span class="c">!write(*,*)&#39;TOKEN_END   &#39;,token_end</span>
   <span class="n">chomp</span><span class="o">=</span><span class="n">isource_len</span><span class="o">-</span><span class="n">token_end</span>
   <span class="k">if</span><span class="p">(</span><span class="n">chomp</span><span class="p">.</span><span class="n">ge</span><span class="p">.</span><span class="mi">0</span><span class="p">)</span><span class="k">then</span>
<span class="k">      </span><span class="n">token</span><span class="o">=</span><span class="n">source_string</span><span class="p">(</span><span class="n">token_start</span><span class="p">:</span><span class="n">token_end</span><span class="p">)</span>
      <span class="n">source_string</span><span class="o">=</span><span class="n">source_string</span><span class="p">(</span><span class="n">token_end</span><span class="o">+</span><span class="mi">1</span><span class="p">:)</span>
   <span class="k">else</span>
<span class="k">      </span><span class="n">token</span><span class="o">=</span><span class="s1">&#39;&#39;</span>
      <span class="n">source_string</span><span class="o">=</span><span class="s1">&#39;&#39;</span>
   <span class="k">endif</span>
<span class="c">!-----------------------------------------------------------------------------------------------------------------------------------</span>
<span class="k">end function </span><span class="n">chomp</span>
</pre></div>

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            Documentation generated by 
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